"Batan police received information about a foreign boat illegally fishing in Philippine waters on Sunday and immediately sent two maritime police, along with four fishermen, to expel the Taiwanese fishing vessel," Lu said.

"During the chase, because the Taiwanese fishing vessel, which was bigger than its Philippine counterpart, had once hit the Philippine boat, the Philippine police then opened fire on the Taiwanese vessel," Lu said.

The ministry's comments yesterday contradicted a statement it made on Monday that Philippine authorities were not involved.

Lu said the ministry had lodged a protest with the Philippines yesterday about the use of force by police as they executed hot pursuit -- the right a country has to expel and pursue alien boats trespassing in its territorial waters.

Lu said the right of hot pursuit doesn't allow the Philippine authorities to use force.

An official from the Philippines' representative office in Taipei, Resurrecion Montana-Fernando, met ministry officials yesterday.

"If any of our officials were involved, we'll definitely prosecute the officials and bring them to justice," Montana-Fernando said.